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slice vs split on Date
(version: 0)
Comparing performance of:
slice vs split
Created:
2 years ago
by:
Guest
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Script Preparation code:
var tzoffset = (new Date()).getTimezoneOffset() * 60000; //offset in milliseconds var localISOTime = (new Date(Date.now() - tzoffset)).toISOString().replace('T', ' ')
Tests:
slice
localISOTime = localISOTime.slice(0, -5);
split
localISOTime = localISOTime.split('.')[0];
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
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Test case name
Result
slice
split
Fastest:
N/A
Slowest:
N/A
Latest run results:
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down the provided JSON and explain what's being tested, compared, and the pros/cons of different approaches. **What is being tested?** MeasureThat.net is testing two methods to extract the last 5 characters from a `Date` object in JavaScript: `slice()` and `split()`. The test aims to determine which method is faster and more efficient for this specific use case. **Options compared** The main options being compared are: 1. **Slice**: Using the `slice()` method to extract a subset of characters from a string. 2. **Split**: Using the `split()` method with a dot (`.`) as the separator to extract the first part of a string. **Pros and Cons:** * **Slice**: + Pros: Simple, straightforward, and widely supported. + Cons: May not be optimized for this specific use case, potentially slower than other methods. * **Split**: + Pros: Can be faster than `slice()` because it avoids creating a new string. + Cons: Requires an additional separator (`.`) to split the date string, which might not be desirable. **Library and its purpose** None explicitly mentioned in this benchmark. However, note that `Date` objects in JavaScript use the ISO 8601 standard for dates, where the time zone offset is typically represented as a numeric value (e.g., +1200 or -0600). The script preparation code calculates the timezone offset in milliseconds and uses it to create a local date string without the time zone information. **Special JS feature or syntax** None explicitly mentioned. However, note that this benchmark does not use any advanced JavaScript features like async/await, Promises, or modern ECMAScript syntax (e.g., arrow functions, template literals). **Other alternatives** Other methods to extract the last 5 characters from a string in JavaScript might include: * Using regular expressions with `RegExp.prototype.exec()` * Using `substr()` or `substring()` methods * Using a library like Lodash's `chain` function with `_.slice()`
Related benchmarks:
Date Split or Slice
Date Split or Slice 2
Get Time in Arbitrary TimeZone
ISO-Date slice vs split
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